Figure caption: The elastic diffuse scattering around the (1,0,0) Bragg peak of Pb(Mg1/3Nb2/3)O3 at 200K. The data was taken on the disk chopper spectrometer (DCS) at the NCNR, NIST. See GY Xu et al., Phys. Rev. B 69 064112 (2004) for more details.